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tc120-1 7/18/00 tc120 ?2001 microchip technology inc. ds21365a pwm/pfm step-down combination regulator/controller features internal switching transistor supports 600ma output current external switching transistor control for output currents of 2a+ 300 khz oscillator frequency supports small inductor size short circuit protection built-in undervoltage lockout high (95%, typ) efficiency automatic switchover to current-saving pfm mode at low output loads automatic output capacitor discharge while in shutdown programmable soft-start time power-saving shutdown mode small 8-pin sop package typical applications portable test equipment local logic supplies portable audio systems portable scanners palmtops electronic organizers general description tc120 is a 300 khz pfm/pwm step-down (buck) dc/dc regulator/controller combination for use in systems operating from two or more cells, or in line-powered applica- tions. it uses pwm as the primary modulation scheme, but automatically converts to pfm at low output loads for greater efficiency. it requires only an external inductor, schottky diode, and two capacitors to implement a step-down con- verter having a maximum output current of 600 ma (v in =5v, v out = 3.3v). an external switching transistor (p-channel mosfet) can be added to increase output current capabil- ity to support output loads of 2a or more. the tc120 consumes only 55 a (max) of supply cur- rent (v out = 3.3v) and can be placed in shutdown mode by bringing the shutdown input (shdn) low. during shutdown, the regulator is disabled, supply current is reduced to 2.5 a(max), and v out is internally pulled to ground, discharg- ing the output capacitor. normal operation resumes when shdn is brought high. other features include a built-in undervoltage lockout (uvlo), an externally programmable soft start time, and output short circuit protection. the tc120 operates from a maximum input voltage of 10v and is available in a low-profile 8-pin sop package. typical application pin configuration ordering information part no. output package temperature voltage (v) range tc120303eha 3.0 8-pin sop ?40 c to +85 c tc120333eha 3.3 8-pin sop ?40 c to +85 c tc120503eha 5.0 8-pin sop ?40 c to +85 c tc120 v in extw cpc shdn/ss l x ext gnd sense 47 f/16v tantalum c ss 4.7 nf in5817 l1 22 h v out = 3v v in = 5v c out 47 f/10v tantalum 5v to 3.0v, 500 ma step-down converter 1 2 3 4 8 7 6 5 tc120 8-pin sop extw cpc shdn/ss v in gnd ext sense l x
2 pwm/ptm step-down combination regulator/controller tc120 tc120-1 7/18/00 ?2001 microchip technology inc. ds21365a absolute maximum ratings* power supply voltage (v in ) ....................... ?.3v to +12v voltage on v out pin ................................... ?.3v to +12v voltage on lx, boost pins ...... (v in ?12v) to (v in + 0.3v) voltage on ext1, ext2, shdn pins ................................................ (?.3v) to (v in + 0.3v) l x pin current ........................................................700ma ext1, ext2 pin current ........................................ 50ma continuous power dissipation .............................. 300mw electrical characteristics: (test circuit of figure 1, t a = 25 c, v in =v r x 1.2, note 1, unless other-wise noted) symbol parameter test conditions min typ max unit v out output voltage v r = 3.0, i out =120ma (note 1) v r x 0.975 v r 0.5% v r x 1.025 v v r = 3.3, i out =132ma v r = 5.0, i out =200ma v in input voltage 1.8 10 v i out(max) maximum output current v out = 3.0v 500 ma v out = 3.3v 600 v out = 5.0v 600 i in supply current v in = v r x 1.05, v out = 3.0v 52 82 a no load v out = 3.3v 55 86 v out = 5.0v 71 110 i shdn shutdown supply current (note 2), 1.5 2.5 a no load, shdn = 0v i lx lx pin leakage current measured at ext 1 pin (note 2) 2 a no load, shdn = 0v 1.5 2.5 r dson(lx) lx pin on resistance v out = v r x 0.9 (note 2) v out = 3.0v 0.69 0.94 ? v lx = v in ?0.2v, 10 ? v out = 3.3v 0.64 0.85 resistor from l x to v in ,v out = 5.0v 0.44 0.58 shdn = v in r exth ext1, ext2 (note 2); v out = 3.0v 38 52 ? on resistance to v in shdn = v ih ; ext1 and v out = 3.3v 35 47 ext 2 connected to v out = 5.0v 24 32 200 ? load, v ext1 = v ext2 = (v in ?0.4v); v out = v in r extl ext1, ext2 (note 2); v out = 3.0v 31 41 ? on resistance to gnd shdn = v ih ; ext1 and v out = 3.3v 29 37 ext2 pulled up through v out = 5.0v 20 26 a series resistance of 200 ? to a voltage such that vext1, 2 = 0.4v f osc oscillator frequency measured at ext1 pin, v in = v out +0.3v, 255 300 345 khz i out = 20ma, (note 3) d pwm maximum pwm duty cycle 100 % d pfm pfm duty cycle no load 15 25 35 % efficiency v in > v r x 1.2 95 % operating temperature (t c ) ...................... ?0 c to 85 c storage temperature (t stg ) .................... ?0 c to 150 c *static-sensitive device. unused devices must be stored in conductive material. protect devices from static discharge and static fields. stresses above those listed under absolute maximum ratings may cause perma- nent damage to the device. these are stress ratings only and functional operation of the device at these or any other conditions above those indicated in the operational sections of the specifications is not implied. exposure to absolute maximum rating conditions for extended periods may affect device reliability.
3 tc120 pwm/ptm step-down combination regulator/controller tc120-1 7/18/00 ?2001 microchip technology inc. ds21365a electrical characteristics: (test circuit of figure 1, t a = 25 c, v in =v r x 1.2, note 1, unless other-wise noted) symbol parameter test conditions min typ max unit v uvlo minimum operating voltage v out = v r x 0.9 (note 2), shdn = v in 0.9 1.8 v measured with internal transistor in off state and v in falling. v ih shdn input logic high (note 2), v out = 0v 0.65 v threshold voltage v il shdn input logic low (note 2), v out = 0v 0.2 v threshold voltage t pro short circuit protection (note 2) time from v out = 0v to 3 5 8 msec response time shdn = v il t ss soft start time 6 10 16 msec notes: 1. v r is the factory-programmed output voltage setting. 2. no external components connected, except c ss . 3. while operating in pwm mode. pin description pin number name description 1v in unregulated supply input. 2 extw extended external switching transistor drive output. this output follows the timing on the ext output with an additional 100nsec blanking time on both the leading and trailing edges. that is, this output transitions from high-to-low 100nsec prior to the same transition on ext; and transitions low-to-high 100nsec after the same transition on ext; resulting in a longer external switch on time. ( see operation as a regulator controller for more information). 3 cpc charge pump capacitor input. an inverting charge pump is formed by attaching a capacitor and diode to this input (please see improving high load efficiency in regulator operating mode section). 4 shdn/ss shutdown and soft-start control input. a soft start capacitor of 100pf (min) must be connected to this input. the soft start capacitor is charged by an internal 1 a current source that gently ramps the tc120 into service. shutdown control is best implemented with an external open collector (or open drain) switch. the tc120 enters shutdown when this input is low. during shutdown, the regulator is disabled, and supply current is reduced to less than 2.5 a. normal operation is restored when this input is open-circuited, and allowed to float high. please see shdn/ss section for details. 5 sense voltage sense input. this input must be connected to the output voltage node at the physical location that requires the tightest voltage regulation. 6 gnd ground terminal. 7 ext external switching transistor drive output. this output connects directly to the gate of an external p-channel mosfet for applications requiring output currents greater than 600ma. the timing of this output exactly matches that of the gate drive for the internal p-channel transistor. this output can drive a maximum capacitance of 1000 pf. (see operation as a regulator controller for more information). 8l x inductor terminal. this pin is connected to the drain of the internal p-channel switching transistor. if the tc120 is operated as a regulator (i.e. using the internal switch); the inductor must be connected between this pin and the sense pin.
4 pwm/ptm step-down combination regulator/controller tc120 tc120-1 7/18/00 ?2001 microchip technology inc. ds21365a detailed description the tc120 can be operated as an integrated step-down regulator (using the internal switching transistor); or as a step-down regulator controller (using an external switching transistor). when operating as an integrated regulator, the only required external components are a shottky diode, inductor and an output capacitor. operating in this configu- ration, the tc120 is capable of supporting output load currents to a maximum of 600 ma with operating efficiencies above 85%. (efficiencies at high loads can be further im- proved by using the on-board charge pump circuit to pull the gate of the internal switching transistor below ground for the lowest possible on resistance. for more information, see improving high load efficiency in regulator operating mode section). higher output currents are achieved by operating the tc120 with an external p-channel switching transistor ( controller mode). in this operating configuration, the maxi- mum output current is determined primarily by the on resistance of the p-channel switch and the series resis- tance of the inductor. inductor selection selecting the proper inductor value is a trade-off be- tween physical size and power conversion requirements. lower value inductors cost less, but result in higher ripple current and core losses. they are also more prone to saturate since the coil current ramps faster and could overshoot the desired peak value. this not only reduces efficiency, but could also cause the current rating of the external components to be exceeded. larger inductor val- ues reduce both ripple current and core losses, but are larger in physical size and tend to increase the start-up time slightly. a 22 h inductor is the best overall compromise and is recommended for use with the tc120. for highest effi- ciency, use inductors with a low dc resistance (less than 20 m ? ). to minimize radiated noise, consider using a toroid, pot core or shielded-bobbin inductor. input bypass capacitor using an input bypass capacitor reduces peak current transients drawn from the input supply, and reduces the switching noise generated by the regulator. the source impedance of the input supply determines the size of the capacitor that should be used. output capacitor the effective series resistance of the output capacitor directly affects the amplitude of the output voltage ripple. (the product of the peak inductor current and the esr determines output ripple amplitude.) therefore, a capacitor with the lowest possible esr should be selected. smaller capacitors are acceptable for light loads or in applications where ripple is not a concern. a 47 f tantalum capacitor is recommended for most applications. the sprague 595d series of tantalum capacitors are amongst the smallest of all low esr surface mount capacitors available. table 1 lists suggested component numbers and manufacturers. catch diode the high operating frequency of the tc120 requires a high-speed diode. schottky diodes such as the ma737 or 1n5817 through 1n5823 (and the equivalent surface mount versions) are recommended. select a diode whose average current rating is greater than the peak inductor current; and whose voltage rating is higher than v in(max) . improving high load efficiency in regulator operating mode if the tc120 is operated at high output loads most (or all) of the time, efficiency can be improved with the addition of two components. ordinarily, the voltage swing on the gate of the internal p-channel transistor is from ground to v in . by adding a capacitor and diode as shown in figure 3, an inverting charge pump is formed, enabling the internal gate voltage to swing from a negative voltage to +v in . this increased drive lowers the r ds(on) of the internal transistor, improving efficiency at high output currents. care must be taken to ensure the voltage measured between v in and cpc does not exceed an absolute value of 10v. while this is not a problem at values of v in at (or below) 5v, higher v in values will require the addition of a clamping mechanism (such as a zener diode) to limit the voltage as described. while this technique improves efficiency at high output loads, it is at the expense of low load efficiency because energy is expended charging and discharging the charge pump capacitor. this technique is therefore not recommended for applications that operate the tc120 at low output currents for extended time periods. if unused, cpc must be grounded. figure 1. test circuit tc120xx03 v in extw cpc shdn/ss l x ext gnd sense 47 f/10v tantalum c ss 4.7 nf in5817 l1 22 h v out v in c out 47 f/10v tantalum
5 tc120 pwm/ptm step-down combination regulator/controller tc120-1 7/18/00 ?2001 microchip technology inc. ds21365a low power shutdown mode/soft start input the shdn/ss input acts as both the shutdown control and the node for the external soft start capacitor, which is charged by an internal 1 a current source. a value of 4700 pf (100 pf minimum) is recommended for the soft start capacitor. i failure to do this may cause large overshoot voltages and/or large inrush currents resulting in possible instability. the tc120 enters a low power shutdown mode when shdn/ss is brought low. while in shutdown, the oscillator is disabled and the output discharge switch is turned on, discharging the output capacitor. figure 4 shows the recommended interface circuits to the shdn/ss input. as shown, the shdn/ss input should be controlled using an open collector (or open drain) device, such that the shdn/ ss input is grounded for shutdown mode, and open-cir- cuited for normal operation (figure 5a). if a cmos device is used to control shutdown (figure 5b), the value of r1 and c ss should be chosen such that the voltage on shdn/ss rises from ground to 0.65v in 1.5 msec (figure 6). if shutdown is not used, c ss must still be connected as shown in figures 5c and 5d. shdn/ss may be pulled up with a resistor (figure 5c) as long as the values of r ss and c ss provide the approximate charging characteristic on power up shown in figure 6. c ss only may also be connected as shown in figure 5d with c ss chosen at 4700 pf (minimum 100 pf). undervoltage lockout (uvlo) the tc120 is disabled whenever v in is below the undervoltage lockout threshold. this threshold is equal to the guaranteed minimum operating voltage for the tc120 (i.e. 2.2v). when uvlo is active, the tc120 is completely disabled. short circuit protection upon detection of an output short circuit condition, the tc120 reduces the pwm duty cycle to a minimum value using its internal protection timer. the sequence of events is as follows: when an output voltage decrease to near zero is detected (as the result of an overload), the internal (5 msec) protection timer is started. if the output voltage has not recovered to nominal value prior to the expiration of the protection timer, the tc120 is momentarily shut down by dedicated, internal circuitry. immediately following this ac- tion, the soft start sequence is engaged in an attempt to re- start the tc120. if the output short circuit is removed, normal operation is automatically restored. if the short circuit is still present, the timed self-shutdown sequence described above is repeated. operation as a regulator controller external switching transistor selection ext is a complimentary output with a maximum on resistances of 32 ? to v dd when high and 26 ? to ground when low, at v out = 5v. it is designed to directly drive a p- channel mosfet (figure 7). the p-channel mosfet selection is determined mainly by the on-resistance, gate- source threshold and gate charge requirements. also, the drain-to-source and gate-to-source breakdown voltage rat- ings must be greater than v in(max) . the total gate charge specification should be less than 100 nc for best efficiency. the mosfet must be capable of handling the required peak inductor current, and should have a very low on- resistance at that current. for example, a si9430 mosfet has a drain-to-source rating of ?0v, and a typical on- resistance r ds(on) of 0.07 ? at 2a, with v gs = ?.5v. (extw (figure 8) may be gated with external circuitry to add blanking, or as an auxiliary timing signal.) table a lists suppliers of external components recommended for use with the tc120. board layout guidelines as with all inductive switching regulators, the tc120 generates fast switching waveforms, which radiate noise. interconnecting lead lengths should be minimized to keep stray capacitance, trace resistance and radiated noise as low as possible. in addition, the gnd pin, input bypass capacitor and output filter capacitor ground leads should be connected to a single point. the input capacitor should be placed as close to power and ground pins of the tc120 as possible. the length of the ext trace must also be kept as short as possible.
6 pwm/ptm step-down combination regulator/controller tc120 tc120-1 7/18/00 ?2001 microchip technology inc. ds21365a figure 2. tc120 typical application figure 3. tc120 with added components for improved efficiency at high output currents tc120xx03 v in extw cpc shdn/ss l x ext gnd sense c in d1 l1 v out v in c out c ss 4.7 nf tc120xx03 v in extw cpc shdn/ss l x ext gnd sense d 1 in5817 a) for v in 5v c p 2200 pf ceramic tc120xx03 v in extw cpc shdn/ss l x ext gnd sense d 1 in5817 b) for v in > 5v c p 2200 pf ceramic 10v zener diode v in 5v v in > 5v
7 tc120 pwm/ptm step-down combination regulator/controller tc120-1 7/18/00 ?2001 microchip technology inc. ds21365a 2 in5817 2n2222a 47k extw nc shutdown control j1 j4 charge pump 10v zener 3 4 tc120 1 8 5 6 7 v in 47 f 16v tantalum 22 h 47 f 10v v in ui v in v in v out ext w css 4700pf 2200pf in5817 switching transistor j2 cpc sense gnd ext lx in out int ext shdn/ss j3 charge pump p-channel mosfet c3 c1 d1 d2 q1 q2 d3 l1 c2 r1 tc120 demo board the tc120 demo allows the user to quickly prototype tc120-based circuits. the tc120 demo consists of a printed circuit board and tc120. the schottky diodes, zener diode, input capacitor, output capacitor, charge pump ca- pacitor, external p-channel fet switch, npn transistor (for shutdown), soft-start capacitor (c ss ), and 22 h inductor may be selected by the design engineer utilizing the compo- nent selection criteria previously discussed as well as the suggested components in table 1. the circuit schematic appears in figure 4. jumper block j1 controls shutdown by: 1) connecting to v in to shut down the tc120 (note: the tc120? soft-start feature is disabled in this mode), or 2) connecting to ground to enable the tc120. capacitor c ss allows the tc120 to power on in a soft-start mode. connecting jumper block j2 to int disables the gate drive to the external p-channel mosfet and the tc120? internal switching transistor is used to control the output. the internal transistor of the tc120 can be used for output loads up to 600 ma. connect- ing j2 to ext and j3 to out ( note: both of these connections are required to drive the external p-chan- nel fet ) allows the user to enable the gate drive to the external p-channel mosfet to drive higher current output loads (up to 2 amps). connecting jumper block j3 to in enables an inverting charge pump (via external components d2 and c3) in the tc120 that improves the efficiency of the device at higher loads when the internal switch of the tc120 is used (for loads up to 600 ma). an inverting charge pump is formed in this configuration which increases the internal transistor? gate voltage (from a negative voltage to vin) to lower the on resistance of the internal switching transistor. connecting jumper block j4 to extw allows for an extended external gate drive to the p-channel fet (see figure 8). in this mode, the fet will turn on about 100 nsec earlier and remain on about 100 nsec later than int he normal external switching mode. figure 4. demo board schematic
8 pwm/ptm step-down combination regulator/controller tc120 tc120-1 7/18/00 ?2001 microchip technology inc. ds21365a figure 5. shutdown control circuits shdn/ss tc120xx03 c ss shdn/ss tc120xx03 c ss shdn/ss tc120xx03 c ss 4.7 nf shdn/ss tc120xx03 r ss v in shdn on off shdn on off 47k 2n2222 c ss 4.7 nf r 1 v in cmos gate a) using an open collector device b) using a complementary output device c) shutdown not used ?with pull-up d) shutdown not used ?no pull-up the table below summarizes the jumper connections for different modes of operation of the tc120. mode j1 j2 j3 j4 shutdown v in internal switching without inverting charge pump ground int open open internal switching with inverting charge pump ground int in open normal external switching (via ext) ground ext out open extended external switching (via ext w ) ground ext open extw
9 tc120 pwm/ptm step-down combination regulator/controller tc120-1 7/18/00 ?2001 microchip technology inc. ds21365a figure 6. soft start timing figure 7. using external transistor switch figure 8. external (ext) and extended external (extw) switching transistor drive output off on 0.65v 0v 1.5 msec shdn/ss shutdown signal x ext extw 100 nsec 100 nsec tc120xx03 v in extw cpc shdn/ss l x ext gnd sense c ss 4.7 nf in5817 l1 22 h v out v in c in 47 f tantalum c out 47 f tantalum
10 pwm/ptm step-down combination regulator/controller tc120 tc120-1 7/18/00 ?2001 microchip technology inc. ds21365a table 1. suggested components and manufacturers type inductors capacitors diodes transistors surface mount sumida avx motorola silconix cd54 series tps series mbrs340t3 little foot mosfet series cdrh series sprague nihon zetex fzt749 coilcraft 595d series nsq series pnp bipolar transistor do series matsushita toshiba 2sa1213 pnp ma737 transistor miniature sumida sanyo irc through hole rch series os-con series oar series standard coilcraft nichicon motorola through-hole pch series pl series tmos power mosfets united chemi-con lxf series taping diagram pin 1 pin 1 component taping orientation for 8-pin sop user direction of feed user direction of feed standard reel component orientation for 713 or tr suffix device reverse reel component orientation for 723 or rt suffix device w = width of carrier tape p = pitch package carrier width (w) pitch (p) part per full reel reel size 8-pin sop 12 mm 8.0 mm 1000 7 in carrier tape, reel size, and number of components per reel
11 tc120 pwm/ptm step-down combination regulator/controller tc120-1 7/18/00 ?2001 microchip technology inc. ds21365a package dimensions dimensions: inches (mm) 8-pin sop .181 (4.60) .165 (4.20) .217 (5.50) .193 (4.90) .069 (1.75) .055 (1.40) .008 (0.20) .000 (0.00) .020 (0.50) .012 (0.30) .256 (6.50) .232 (5.90) pin 1 .010 (0.25) .004 (0.10) .018 (0.45) .014 (0.35) 8 max. .051 (1.30) .049 (1.24)
12 pwm/ptm step-down combination regulator/controller tc120 tc120-1 7/18/00 ?2001 microchip technology inc. ds21365a information contained in this publication regarding device applications and the like is intended through suggestion only and ma y be superseded by updates. it is your responsibility to ensure that your application meets with your specifications. no representation or warrant y is given and no liability is assumed by microchip technology incorporated with respect to the accuracy or use of such information, or infringement of patent s or other intellectual property rights arising from such use or otherwise. use of microchip?s products as critical components in life support systems is not authori zed except with express written approval by microchip. no licenses are conveyed, implicitly or otherwise, except as maybe explicitly expressed herein, under any intellec- tual property rights. the microchip logo and name are registered trademarks of microchip technology inc. in the u.s.a. and othe r countries. all rights reserved. all other trademarks mentioned herein are the property of their respective companies. all rights reserved. ? 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